> ## Documentation Index
> Fetch the complete documentation index at: https://docs.daily.co/llms.txt
> Use this file to discover all available pages before exploring further.

# VCS tools

> Full reference documentation to help developers rapidly add calls to any site or app using the Daily real-time API built on WebRTC.

<Badge color="blue">Paid plans only</Badge>

VCS offers CLI (command line interface) build and development tools in the `js` folder. They are accessible using the yarn package manager (see our [Installation page](/docs/vcs/installation) for more information).

These tools let you develop compositions more easily with the simulator. You can also export your composition as a JavaScript library package that can be loaded on a web page.